1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2004, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
** $Id$
\* */
package scala.tools.nsc.util;
import scala.tools.util.AbstractFile;
import scala.tools.util.CharArrayFile;
/** Uses positions that are offsets rather than line/column pairs.
*
* @author Sean McDirmid
*/
object SourceFile {
val LF : Char = 0x0A;
val FF : Char = 0x0C;
val CR : Char = 0x0D;
val SU : Char = 0x1A;
def isLineBreak(c : Char) = c == LF || c == FF || c == CR || c == SU;
}
class SourceFile(_file : AbstractFile, _content : Array[Char]) {
import SourceFile._;
val file = _file;
val content = normalize(_content);
def getContent() = content;
def getFile() = file;
def this(sourceName: String, content : Array[Char]) =
this(new CharArrayFile(sourceName, content), content);
def isLineBreak(idx : Int) = if (!SourceFile.isLineBreak(content(idx))) false;
else if (content(idx) == CR && idx + 1 < content.length && content(idx + 1) == LF) false;
else true;
def position(offset : Int) = new Position(this, offset);
def position(line : Int, column : Int) = new Position(this, lineToOffset(line) + column);
// constants
// NOTE: all indexes are based on zero!!!!
override def toString(): String = file.getName() /* + ":" + content.length */ ;
def dbg(offset : Int) = (new Position(this, offset)).dbgString;
object line {
var index = 0;
var offset = 0;
def find(toFind : Int, isIndex : Boolean) : Int = {
if (toFind == 0) return 0;
if (!isIndex) assert(toFind != Position.NOPOS);
if ( isIndex) assert(toFind > Position.NOLINE - Position.FIRSTLINE);
if (!isIndex && (toFind >= content.length)) throw new Error(toFind + " not valid offset in " + file.getName() + ":" + content.length);
def get(isIndex : Boolean) = if (isIndex) index else offset;
val isBackward = toFind <= get(isIndex);
val increment = if (isBackward) -1 else + 1;
val oneIfBackward = if (isBackward) +1 else 0;
// System.err.println("FIND-0: " + toFind + " " + isIndex);
while (true) {
// System.err.println("FIND-1: " + offset + " " + index);
if (!isIndex && offset == toFind) return index;
if ( isBackward && offset <= 0) throw new Error(offset + " " + index + " " + toFind + " " + isIndex);
offset = offset + increment;
if (!isBackward) assert(offset < content.length);
if (isLineBreak(offset + (if (isBackward) 0 else -1))) {
index = index + increment;
if (isIndex && index + oneIfBackward == toFind)
return offset + oneIfBackward;
}
}
throw new Error();
}
}
def offsetToLine(offset : Int) : Int = line.find(offset, false);
def lineToOffset(index : Int) : Int = line.find(index , true);
def beginsWith(offset : Int, text : String): Boolean = {
var idx = 0;
while (idx < text.length()) {
if (offset + idx >= content.length) return false;
if (content(offset + idx) != text.charAt(idx)) return false;
idx = idx + 1;
}
return true;
}
def path = getFile().getPath();
def skipWhitespace(offset : Int): Int =
if (Character.isWhitespace(content(offset))) skipWhitespace(offset + 1) else offset;
def lineToString(index : Int) = {
var offset = lineToOffset(index);
val buf = new StringBuffer();
while (!isLineBreak(offset) && offset < content.length) {
buf.append(content(offset));
offset = offset + 1;
}
buf.toString();
}
private def normalize(input : Array[char]): Array[char] =
if (input.length > 0 && input(input.length - 1) == SU) input;
else {
val content = new Array[char](input.length + 1);
System.arraycopy(input, 0, content, 0, input.length);
content(input.length) = SU;
content;
}
}
|
